Currently in the process of registering my '70 M818 5-ton the same way as Blendmaster, so far everything has gone according to plans, which is good.
Originally, DMV wanted $709 per year in combined fees, most of which were weight fees,to register the 818, plus VIN verification, plus certified weigh certificate from a authorized weigh-master, then bring everything back to DMV with no "real" guarantee that they would process it to be legal.
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This was after I asked to have it registered as "Historic", but the clerk at the DMV did not hear that part or was not familiar.
I have a local DMV registration office just blocks from my house, and I explained the entire situation to them. They were very helpful and did all the leg-work including the VIN verification, which was basically walking out to the truck and reading the data plate back to them. Took less than 5 minutes.
Cost, for me, was $396 that included all transfer/title fees plus the registration and also got the temporary red sticker for driving until I get word back from Sacramento.
Currently, unless I hear otherwise, I am legal to drive until the end of November or further if my plates and stickers come in the mail.
I will update if anything changes.